河套盆地~68.6—46.4 ka BP古植被演替及最暖月气温变化特征

doi:10.12118/j.issn.1000-6060.2024.721

Abstract

Abstract:

Utilizing the established age framework of the HJ01 borehole in the Hetao Basin, Inner Monglia, China, we conducted pollen analysis on 207 samples from lacustrine sediments. We employed the weighted average partial least squares regression method to quantitatively reconstruct the temperature changes during the warmest month in the Hetao Basin from approximately 68.6 ka BP to 46.4 ka BP. The results indicate the following. (1) The primary vegetation types in the Hetao Basin are desert grasslands, with variations in the content of major families and genera at different stages; the surrounding mountainous areas have developed coniferous forests, predominantly of spruce, which have experienced two phases of expansion and one phase of retreat. (2) From approximately 68.6 ka BP to 57.0 ka BP, the warmest month temperature averaged 14.2 ℃, fluctuating between 10.1 ℃ and 16.9 ℃, suggesting an overall cold climate. The average temperature increase during the warmest month from approximately 57.0 ka BP to 52.2 ka BP was 1.5 ℃. The highest temperature recorded was 15.7 ℃, with fluctuations between 10.5 ℃ and 21.6 ℃, indicating a warming climate. From approximately 52.2 ka BP to 46.4 ka BP, the warmest month temperature averaged 15.8 ℃, with fluctuations between 13.2 ℃ and 17.8 ℃, reflecting a relatively warm climate. (3) By comparing the reconstructed temperatures of the warmest month with typical global paleoclimate records, we find that changes in summer solar radiation and Eurasian ice cover in the Northern Hemisphere may significantly influence temperature variations during the warmest month in the Hetao Basin from approximately 68.6 ka BP to 46.4 ka BP. These findings provide a scientific basis for predicting future glacial climate changes.

Key words: MIS4, Hetao Basin, pollen assemblage, quantitative reconstruction of paleoclimate, paleovegetation succession

MA Zixuan, LI Xinling, CAI Maotang, LI Zhizhou, ZHU Haiyu, LIU Siwei. Characteristics of paleovegetation succession and temperature variation in the warmest month at ~68.6—46.4 ka BP in the Hetao Basin[J].Arid Land Geography, 2025, 48(11): 1913-1925.

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References 43

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深度/m	测试年代/ka BP	校正年代/ka BP	稳定同位素/‰
0.65	14.38±40	14.43±40	-21.8
3.80	23.66±90	23.66±90	-24.7
4.48	29.02±150	29.00±150	-26.3
5.30	30.14±160	30.16±160	-24.1
5.75	31.19±180	31.20±180	-24.3
8.40	35.31±270	35.32±270	-24.1

深度/m	铀（U）/µg·g^-1	钍（Th）/µg·g^-1	钾（K）/%	年代/ka BP
11.4	1.92±0.07	6.54±0.29	1.82±0.05	46.03±3.24
18.8	1.82±0.05	5.90±0.18	1.83±0.05	65.22±4.24

方法	距离/km	组分	均方根误差	决定系数	检验后的误差	T检验
WAPLS	800	1	2.7045	0.60923	2.7927	-
		2	2.3962	0.69205	2.5845	0.001
		3	2.3176	0.71186	2.6350	0.685
		4	2.2417	0.73031	2.7240	0.858
	1000	1	2.9247	0.69980	2.9712	-
		2	2.7662	0.73974	2.9013	0.001
		3	2.6803	0.75572	2.9113	0.149
		4	2.6440	0.76221	2.9259	0.157
	1500	1	725.2700	0.15769	781.0700	-
		2	711.4900	0.18899	792.9300	0.529
		3	697.2600	0.22133	808.6800	0.638
		4	688.3200	0.24134	824.9800	0.943
MAT	800	MAT	2.3520	0.71005	2.4588	-
	800	WMAT	2.0321	0.77497	2.1649	-
	1000	MAT	2.3383	0.81541	2.4626	-
	1000	WMAT	2.0828	0.84842	2.2410	-
	1500	MAT	577.9700	0.51834	607.5000	-
	1500	WMAT	568.3000	0.52735	596.4100	-

气候因子	VIF				单气候变量解释程度
气候因子	运行1	运行2	运行3	运行4	解释度/%	P值
年均降水量	2.1148	1.9298	1.8616	1.9820	4.7	0.002
最冷月气温	201.4876	1.5342	4.3666	-	1.8	0.002
最暖月气温	307.6272	1.9914	-	6.6668	7.6	0.002
年均气温	655.5826	-	4.2439	4.9919	0.7	0.002

Characteristics of paleovegetation succession and temperature variation in the warmest month at ~68.6—46.4 ka BP in the Hetao Basin

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